bfd/cpu-avr.c

   1 /* BFD library support routines for the AVR architecture.
   2    Copyright 1999, 2000, 2002 Free Software Foundation, Inc.
   3    Contributed by Denis Chertykov <denisc@overta.ru>
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24
  25 static const bfd_arch_info_type *compatible
  26   PARAMS ((const bfd_arch_info_type *, const bfd_arch_info_type *));
  27
  28 #define N(addr_bits, machine, print, default, next)             \
  29 {                                                               \
  30   8,                            /* 8 bits in a word */          \
  31   addr_bits,                    /* bits in an address */        \
  32   8,                            /* 8 bits in a byte */          \
  33   bfd_arch_avr,                                                 \
  34   machine,                      /* machine */                   \
  35   "avr",                        /* arch_name  */                \
  36   print,                        /* printable name */            \
  37   1,                            /* section align power */       \
  38   default,                      /* the default machine */       \
  39   compatible,                                                   \
  40   bfd_default_scan,                                             \
  41   next                                                          \
  42 }
  43
  44 static const bfd_arch_info_type arch_info_struct[] =
  45 {
  46   /* AT90S1200, ATtiny1x, ATtiny28 */
  47   N (16, bfd_mach_avr1, "avr:1", FALSE, & arch_info_struct[1]),
  48
  49   /* AT90S2xxx, AT90S4xxx, AT90S8xxx, ATtiny22 */
  50   N (16, bfd_mach_avr2, "avr:2", FALSE, & arch_info_struct[2]),
  51
  52   /* ATmega103, ATmega603 */
  53   N (22, bfd_mach_avr3, "avr:3", FALSE, & arch_info_struct[3]),
  54
  55   /* ATmega83, ATmega85 */
  56   N (16, bfd_mach_avr4, "avr:4", FALSE, & arch_info_struct[4]),
  57
  58   /* ATmega161, ATmega163, ATmega32, AT94K */
  59   N (22, bfd_mach_avr5, "avr:5", FALSE, NULL)
  60 };
  61
  62 const bfd_arch_info_type bfd_avr_arch =
  63   N (16, bfd_mach_avr2, "avr", TRUE, & arch_info_struct[0]);
  64
  65 /* This routine is provided two arch_infos and works out which AVR
  66    machine which would be compatible with both and returns a pointer
  67    to its info structure.  */
  68
  69 static const bfd_arch_info_type *
  70 compatible (a,b)
  71      const bfd_arch_info_type * a;
  72      const bfd_arch_info_type * b;
  73 {
  74   /* If a & b are for different architectures we can do nothing.  */
  75   if (a->arch != b->arch)
  76     return NULL;
  77
  78   /* Special case for ATmega[16]03 (avr:3) and ATmega83 (avr:4).  */
  79   if ((a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr4)
  80       || (a->mach == bfd_mach_avr4 && b->mach == bfd_mach_avr3))
  81     return NULL;
  82
  83   /* So far all newer AVR architecture cores are supersets of previous
  84      cores.  */
  85   if (a->mach <= b->mach)
  86     return b;
  87
  88   if (a->mach >= b->mach)
  89     return a;
  90
  91   /* Never reached!  */
  92   return NULL;
  93 }